1. Product Overview
The AVATTO Smart Knob Thermostat (Model WT20R/ZWT20R) is an intelligent temperature control device designed for various heating systems including water heating, electric floor heating, and gas boilers. It features a color screen knob for intuitive control, RGB ambient lighting, and smart connectivity via the Tuya or AVATTO app, supporting voice control with Amazon Alexa and Google Home.
2. Specifications
| Feature | Description |
|---|---|
| Model Number | WT20R/ZWT20R |
| Protection Class | IP20 |
| Current Load | 3A (water heating, gas boiler), Max 16A (electric heating) |
| Sensor | NTC3950, 10K |
| Accuracy | ±1°C |
| Set Temperature Range | 5-45°C |
| Room Temperature Range | 5-99°C |
| Power Consumption | <1.5W |
| Ambient Humidity | 5 ~ 95% RH (Non Condensing) |
| Power Supply | 95~240VAC, 50~60Hz |
3. Installation
The thermostat is suitable for installation within a standard 86mm pattress box or European 60mm pattress box.
3.1. Installation Steps
- Step 1: Keep power off. Ensure the main power supply to the heating system is turned off before beginning installation.
- Step 2: Separate display and bottom. Carefully separate the front display unit from the back mounting plate.
- Step 3: Connect power supply and load. Connect the power supply and heating system load wires to the appropriate terminals on the back mounting plate.
- Step 4: Fix the mounting plate. Secure the mounting plate into the wall box using screws.
- Step 5: Put the front cover and back cover together. Align the front display unit with the mounted back plate and gently push them together until they click into place.
- Step 6: Installation complete.
3.2. Wiring Diagrams
Ensure correct wiring based on your heating system type. Always consult a qualified electrician if you are unsure about wiring connections.
For Gas Boiler Heating (WT20R-BH-3A-W)
For Water Heating (WT20R-WH-3A-W)
For Electric Floor Heating (WT20R-EH-16A-W)
4. Operating Instructions
4.1. Knob Control Functions
- Short press: Enter/confirm settings.
- Long press: Distribute/exit function interface.
- Rotate: Select/adjust function or value.
4.2. Icon Description
The thermostat display shows various icons indicating its status and functions:
- Weather: Current weather conditions.
- Temperature/Date/Time: Current temperature, date, and time.
- Outdoor Humidity: Current outdoor humidity level.
- Wi-Fi: Wi-Fi connection status.
- Week: Day of the week.
- Current Temperature: The detected room temperature.
- Heating: Indicates active heating.
- Programming Cycle: Indicates the current programming cycle.
- Programming Mode: Indicates the current operating mode (e.g., Manual, Program).
In the function interface, additional icons represent settings:
- Power: Switch on/off.
- Set Temperature: Adjust target temperature.
- Language: Select display language.
- Sensor Type: Choose internal, external, or combined sensor.
- Temperature Scale: Switch between °C and °F.
- Programming Mode/Manual Mode: Select operating mode.
- Brightness: Adjust screen brightness.
- Temperature Calibration: Calibrate temperature sensor.
4.3. Basic Operation
- Power On: When powered on, the thermostat displays the home interface.
- Accessing Functions: If the screen is on the home interface and there is no operation, press the knob button to wake up the device. Then press it again to enter the function interface. Select the desired function by rotating the knob, press the knob to enter the option, rotate to select the option, and press the knob to confirm.
- Exiting Functions: Long press the knob to return to the home interface. The blue aperture will form a circle. The thermostat will also automatically return to the main interface after 10 seconds of inactivity after a function is set.
- Wi-Fi Distribution Mode: From the home screen, press and hold the knob button for more than 5 seconds. Release the button, and the Wi-Fi icon will blink, indicating the thermostat has entered distribution mode for app pairing.
4.4. Advanced Settings
- Power: Toggles the thermostat's control over the device. ON means it controls according to settings, OFF means it stops controlling.
- Set Temperature: Allows you to set your desired temperature within the range of 5°C to 45°C.
- Language Selection: Choose between English and German for the display language.
- Sensor Types:
- In (Internal Sensor): Controls temperature based on the thermostat's built-in sensor.
- Ou (External Sensor): Controls temperature based on an external sensor (if connected).
- ALL (Internal/External Sensor): Uses the internal sensor for primary temperature control and the external sensor to limit the maximum floor temperature.
- Temperature Scale: Switches the temperature display between Fahrenheit (°F) and Celsius (°C).
- Programming Mode / Manual Mode:
- Programming Mode: Operates according to a predefined temperature schedule.
- Manual Mode: Allows direct temperature adjustment on the thermostat, overriding the schedule.
- Temperature Calibration: Calibrates the compensated sensor. The compensation range is -9°C to +9°C, with a default of 0°C. Adjust after the thermostat has been running for 30 minutes.
- Brightness: Adjusts the screen brightness from 0% to 100%. If set to 0%, the screen light turns off. Pressing the knob will light up the screen.
4.5. Weekly Program Setup (via App)
The thermostat supports a weekly programmable schedule (5+1+1 mode) with 6 different temperature ranges that can be set for each day via the mobile application.
| Period | Weekday (Mon-Fri) | Weekend (Sat) | Weekend (Sun) | |||
|---|---|---|---|---|---|---|
| Time | Temp. | Time | Temp. | Time | Temp. | |
| Period 1 | 06:00 | 20°C | 06:00 | 20°C | 06:00 | 20°C |
| Period 2 | 08:00 | 15°C | 08:00 | 20°C | 08:00 | 20°C |
| Period 3 | 11:30 | 15°C | 11:30 | 20°C | 11:30 | 20°C |
| Period 4 | 13:30 | 15°C | 13:30 | 20°C | 13:30 | 20°C |
| Period 5 | 17:00 | 22°C | 17:00 | 20°C | 17:00 | 20°C |
| Period 6 | 22:00 | 15°C | 22:00 | 15°C | 22:00 | 15°C |
5. App Connectivity
The AVATTO Smart Knob Thermostat can be controlled remotely using the AVATTO or Smart Life mobile application. The AVATTO app is recommended for more customization functions.
5.1. Download the App
Scan the QR codes below to download the AVATTO or Smart Life APP:
5.2. Connect to the App
- Ensure the thermostat is in Wi-Fi distribution mode (Wi-Fi icon blinking). If not, press and hold the knob button for more than 5 seconds until the Wi-Fi icon blinks.
- Open the AVATTO or Smart Life App on your phone.
- Turn on Bluetooth on your phone. The app should automatically recognize the thermostat.
- Follow the in-app instructions to add the device to your network. This typically involves selecting your Wi-Fi network and entering the password.
6. User Tips
- Neutral Wire: For the electric underfloor heating model, a neutral wire is required for proper installation.
- Boiler Connection: When connecting to an Atag CV-ketel (or similar gas boilers), ensure the thermostat connection is linked to the on/off connector (3/4 dry-contact) in the boiler.
- Power Outage Temperature Compensation: In case of a power outage, it may take a few minutes for the internal temperature sensor to compensate and display the correct temperature once power is restored. This is normal operation.
- External Sensor: The external sensor is primarily used to limit the floor temperature, preventing overheating, especially in electric floor heating systems.
- Temperature Regulation: The device typically regulates temperature in 0.5°C increments.
7. Troubleshooting
- Thermostat not responding to boiler: Verify that the boiler's connection to the thermostat is correctly wired to the on/off (dry-contact) terminals.
- Wi-Fi connection issues: Ensure the thermostat's Wi-Fi icon is blinking (distribution mode). Check that your phone's Bluetooth is enabled and that you are entering the correct Wi-Fi password for a 2.4GHz network.
- Screen scratched: While the product is generally well-protected, minor scratches can occur. If the scratch affects functionality or is significant, contact customer support.
- No Wi-Fi function: Double-check the model number and product specifications. Some variants might not include Wi-Fi. If your model is specified with Wi-Fi, ensure you are following the app connection steps correctly.
- Temperature display inaccurate: Perform a temperature calibration as described in section 4.4. Allow the thermostat to run for 30 minutes before adjusting.
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the thermostat's screen and body. Do not use abrasive cleaners or solvents.
- Avoid Moisture: Keep the thermostat away from excessive moisture or direct water exposure.
- Regular Checks: Periodically check the wiring connections to ensure they are secure.
9. Warranty and Support
For warranty information, please refer to the seller's policy or contact the AVATTO customer support directly. A detailed user manual in PDF format is available for further reference: